<template>
  <div>
    <!-- 面包屑导航区 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>分类参数</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域 -->
    <el-card>
      <el-alert
        title="注意:只允许为第三级分类设置相关参数！"
        type="warning"
        show-icon
        :closable="false"
      >
      </el-alert>
      <!--选择商品分类区域-->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类：</span>
          <!--选择商品分类的级联选择框 options用来指定获取数据源来自哪 -->
          <el-cascader
            v-model="selectedCateKeys"
            :options="catelist"
            :props="cateProps"
            @change="handleChange"
          ></el-cascader>
        </el-col>
      </el-row>
      <!-- tab页签区域 -->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!--添加动态参数的面板 name就不叫first和 second了 而是many和only  原因在API接口1.7.1 sel参数中-->
        <el-tab-pane label="动态参数" name="many">
          <el-button
            type="primary"
            size="mini"
            :disabled="isBtnDisabled"
            @click="addDialogVisible = true"
            >添加参数</el-button
          >
          <!-- 动态参数表格 -->
          <el-table :data="manyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染tag标签也就是展开行部分 -->
                <el-tag
                  v-for="(item, i) in scope.row.attr_vals"
                  :key="i"
                  closable
                  @close="handleClose(i, scope.row)"
                  >{{ item }}</el-tag
                >
                <!-- 输入的文本框 -->
                <!-- 这里下面那个v-if和v-model 有说法，之后也要看一看不要忘，P133节 如果不动态绑定的话，输入内容会影响其他行,(影响原因就是因为每一行都共用了同一个布尔值还有value值，那怎么解决呢，就是为每一行单独提供自己的inputVisible，inputValue)-->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <!-- 能变换的button按钮 -->
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                  >+ New Tag</el-button
                >
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index" label="#"></el-table-column>
            <!-- prop来指定用到manyTableData:[]数据中的哪个属性 -->
            <el-table-column
              label="参数名称"
              prop="attr_name"
            ></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button
                  type="primary"
                  icon="el-icon-edit"
                  size="mini"
                  @click="showEditDialog(scope.row.attr_id)"
                  >编辑
                </el-button>
                <el-button
                  type="danger"
                  icon="el-icon-delete"
                  size="mini"
                  @click="removeParams(scope.row.attr_id)"
                  >删除
                </el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <!-- 添加静态属性的面板-->
        <el-tab-pane label="静态属性" name="only">
          <el-button
            type="primary"
            size="mini"
            :disabled="isBtnDisabled"
            @click="addDialogVisible = true"
            >添加属性
          </el-button>
          <!-- 静态属性表格 -->
          <el-table :data="onlyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染tag标签也就是展开行部分 -->
                <el-tag
                  v-for="(item, i) in scope.row.attr_vals"
                  :key="i"
                  closable
                  @close="handleClose(i, scope.row)"
                  >{{ item }}</el-tag
                >
                <!-- 输入的文本框 -->
                <!-- 这里下面那个v-if和v-model 有说法，之后也要看一看不要忘，P133节 如果不动态绑定的话，输入内容会影响其他行,(影响原因就是因为每一行都共用了同一个布尔值还有value值，那怎么解决呢，就是为每一行单独提供自己的inputVisible，inputValue)-->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <!-- 能变换的button按钮 -->
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                  >+ New Tag</el-button
                >
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index" label="#"></el-table-column>
            <!-- prop来指定用到manyTableData:[]数据中的哪个属性 -->
            <el-table-column
              label="属性名称"
              prop="attr_name"
            ></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button
                  type="primary"
                  icon="el-icon-edit"
                  size="mini"
                  @click="showEditDialog(scope.row.attr_id)"
                  >编辑
                </el-button>
                <el-button
                  type="danger"
                  icon="el-icon-delete"
                  size="mini"
                  @click="removeParams(scope.row.attr_id)"
                  >删除
                </el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>
    <!-- 添加参数的对话框 -->
    <el-dialog
      :title="'添加' + titleText"
      :visible.sync="addDialogVisible"
      width="50%"
      @close="addDialogClosed"
    >
      <!-- 添加参数的对话框 -->
      <el-form
        ref="addFormRef"
        :model="addForm"
        label-width="100px"
        :rules="addFormRules"
      >
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>
    <!-- 修改参数的对话框 -->
    <el-dialog
      :title="'修改' + titleText"
      :visible.sync="editDialogVisible"
      width="50%"
      @close="editDialogClosed"
    >
      <!-- 修改参数的对话框 -->
      <el-form
        ref="editFormRef"
        :model="editForm"
        label-width="100px"
        :rules="editFormRules"
      >
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      //商品分类列表
      catelist: [],
      //级联选择框的配置对象
      cateProps: {
        expandTrigger: "hover",
        value: "cat_id",
        label: "cat_name",
        children: "children",
      },
      //级联选择框双向绑定到的数组
      selectedCateKeys: [],
      //   被激活的页签的名称name
      //   activeName: "first",
      activeName: "many",
      //动态参数的数据
      manyTableData: [],
      //静态属性的数据
      onlyTableData: [],
      //   控制添加对话框的显示和隐藏
      addDialogVisible: false,
      //添加参数的表单数据对象
      addForm: {
        attr_name: "",
      },
      //添加表单验证规则对象
      addFormRules: {
        attr_name: [
          { required: true, message: "请输入参数名称", trigger: "blur" },
        ],
      },
      //控制修改对话框的显示与隐藏
      editDialogVisible: false,
      //修改的表单数据对象
      editForm: {},
      //修改表单验证规则对象
      editFormRules: {
        attr_name: [
          { required: true, message: "请输入参数名称", trigger: "blur" },
        ],
      },
    };
  },
  created() {
    this.getCateList();
  },
  methods: {
    //获取所有的商品分类列表
    async getCateList() {
      const { data: res } = await this.$http.get("categories");
      if (res.meta.status !== 200) {
        return this.$message.error("获取商品分类失败！");
      }

      this.catelist = res.data;
      // console.log(this.catelist);
    },
    //级联选择框选中项变化，会触发这个函数
    handleChange() {
      this.getParamsData();
    },
    // tab页签点击事件的处理函数
    handleTabClick() {
      // 拿到的是点击某一个页签时的name
      // console.log(this.activeName);
      this.getParamsData();
    },
    //获取参数列表数据
    async getParamsData() {
      //   console.log(this.selectedCateKeys);
      //证明选中的不是三级分类
      if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = [];
        this.manyTableData = [];
        this.onlyTableData = [];
        return;
      }
      //证明选中的是三级分类
      //根据所选分类的Id，和当前所处的面板，获取对应的参数
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes`,
        {
          params: { sel: this.activeName },
        }
      );
      if (res.meta.status !== 200)
        return this.$message.error("获取参数列表失败！");

      //   this.$message.success("获取参数列表成功！");
      //   console.log(res.data);
      // 把服务器端的字符串attr_vals转为数组
      res.data.forEach((item) => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(",") : [];
        // 为item 动态绑定inputVisible 和 inputValue
        //控制文本框的显示与隐藏
        item.inputVisible = false;
        //文本框中瑜入的值
        item.inputValue = "";
      });
      // res.data获得全部的信息，有的用于展示，有的用来操作数据
      // console.log(res.data);

      if (this.activeName === "many") {
        this.manyTableData = res.data;
        // console.log(this.manyTableData);
      } else {
        this.onlyTableData = res.data;
      }
    },
    //监听添加对话框的关闭事件
    addDialogClosed() {
      this.$refs.addFormRef.resetFields();
    },
    //点击按钮，添加参数
    addParams() {
      this.$refs.addFormRef.validate(async (valid) => {
        if (!valid) return;
        const { data: res } = await this.$http.post(
          `categories/${this.cateId}/attributes`,
          {
            attr_name: this.addForm.attr_name,
            attr_sel: this.activeName,
          }
        );
        if (res.meta.status !== 201)
          return this.$message.error("添加参数失败！");
        this.$message.success("添加参数成功！");
        this.addDialogVisible = false;
        this.getParamsData();
      });
    },
    //点击按钮，展示修改的对话框
    async showEditDialog(attr_id) {
      //查询当前参数的信息
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes/${attr_id}`,
        {
          params: { attr_sel: this.activeName },
        }
      );

      if (res.meta.status !== 200)
        return this.$message.error("获取参数信息失败！");
      this.editForm = res.data;
      this.editDialogVisible = true;
    },
    //重置修改的表单
    editDialogClosed() {
      this.editForm = {};
      this.$refs.editFormRef.resetFields();
    },
    //点击按钮，修改参数信息
    editParams() {
      this.$refs.editFormRef.validate(async (valid) => {
        // console.log(valid); 点击确定时 valid 这里显示的是true
        if (!valid) return;
        const { data: res } = await this.$http.put(
          `categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
          {
            attr_name: this.editForm.attr_name,
            attr_sel: this.activeName,
          }
        );
        if (res.meta.status !== 200)
          return this.$message.error("修改参数失败！");
        this.$message.success("修改参数成功！");
        this.getParamsData();
        this.editDialogVisible = false;
      });
    },
    //根据Id删除对应的参数项
    async removeParams(attr_id) {
      const confirmResult = await this.$confirm(
        "此操作将永久删除该参数, 是否继续?",
        "提示",
        {
          confirmButtonText: "确定",
          cancelButtonText: "取消",
          type: "warning",
        }
      ).catch((err) => err);
      //用户取消了删除的操作
      if (confirmResult !== "confirm") return this.$message.info("已取消删除");
      //删除的业务逻辑
      const { data: res } = await this.$http.delete(
        `categories/${this.cateId}/attributes/${attr_id}`
      );
      if (res.meta.status !== 200)
        return this.$message.error("删除参数信息失败！");
      this.$message.success("删除参数信息成功！");
      this.getParamsData();
    },
    //文本框失去焦点，或摁下了 Enter都会触发
    async handleInputConfirm(row) {
      //   console.log("ok");
      if (row.inputValue.trim().length === 0) {
        row.inputValue = "";
        row.inputVisible = false;
        // 这里return，他才不会push空白
        return;
      }
      //如果没有return，则证明输入的内容，需要做后续处理
      row.attr_vals.push(row.inputValue.trim());
      row.inputValue = "";
      row.inputVisible = false;
      //需要发起请求，保存这次操作
      this.saveAttrVals(row);
    },
    //点击按钮，展示文本输入框
    showInput(row) {
      row.inputVisible = true;
      //让文本框自动获得焦点
      //   $nextTick方法的作用，就是当页面上元素被重新渲染之后，才会指定回调函数中的代码,也就是可以看做是生命周期钩子，
      this.$nextTick((_) => {
        this.$refs.saveTagInput.$refs.input.focus();
      });
    },
    //将对attr_vals的操作，保存到数据库
    async saveAttrVals(row) {
      const { data: res } = await this.$http.put(
        `categories/${this.cateId}/attributes/${row.attr_id}`,
        {
          attr_name: row.attr_name,
          attr_sel: row.attr_sel,
          attr_vals: row.attr_vals.join(","),
        }
      );
      // 上面这句话达到了更新的操作attr_vals: row.attr_vals.join(","),
      // console.log(row);
      if (res.meta.status !== 200) return this.$message.error("修改参数失败！");
      this.$message.success("修改参数成功！");
    },
    //删除(+New Tag中)对应的参数可选项
    handleClose(i, row) {
      // console.log(row);
      // 这里的删除就是通过数组方法的移除这一项，再重新put一遍而已，而非用到delete的Ajax请求
      row.attr_vals.splice(i, 1);
      //需要发起请求，保存这次操作
      this.saveAttrVals(row);
    },
  },
  computed: {
    //如果按钮需要被禁用，则返回true，否则返回false
    isBtnDisabled() {
      if (this.selectedCateKeys.length !== 3) return true;
      return false;
    },
    //当前选中的三级分类的Id
    cateId() {
      if (this.selectedCateKeys.length === 3) {
        return this.selectedCateKeys[2];
      }
      return null;
    },
    //动态计算标题的文本
    titleText() {
      if (this.activeName === "many") return "动态参数";
      return "静态属性";
    },
  },
};
</script>

<style lang="less" scoped>
.cat_opt {
  margin: 15px 0;
  width: 50%;
}
.el-tag {
  margin: 10px;
}
.input-new-tag {
  width: 120px;
}
</style>